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Plc motor control ladder logic.
Ladder logic for motor control. Motor contactor or starter coils are typically designated by the letter m in ladder logic diagrams. There are three motors m1 m2 m3 having a separate start and stop push button. Ladder programs consist of rungs that house instructions.
This latching will be broken when the stop button is activated. You might wonder why the stop button in this example is normally open. Reference input sp0 i 1 0 is closed the output coil c0 o 3 0.
I0 2 status bit is a logic 1 because the normally closed nc overload relay ol contacts are closed. They are called ladder diagrams because they resemble a ladder with two vertical rails supply power and as many rungs horizontal lines as there are control circuits to represent. Ladder logic is a graphical based industrial programming language used to program and configure programmable logic controllers or plc s.
Plc motor control scheme initially i0 1 status bit is a logic 1 because the normally closed nc stop pushbutton is closed. Electric circuit for the motor starter control. Plc has to start a motor when the start button is pressed and interlocks must be in healthy condition.
The start button will activate the relay or ladder logic relay m10 0. Ladder program for the motor starter control. Once compiled and downloaded to a plc the ladder program is scanned like a book.
Start pushbutton is pressed. Plc programming for 3 motors control in ladder logic write the plc programming motors logic for the following problem. The ladder program is shown in figure a is designed for the following sequential task.
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